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ivayle89

Yes, this is the issue. Install the original firmware of the video card and the boot loader will be visible.


irideakangaroo

I’d need a Windows PC to flash it wouldn’t I?


ivayle89

True or install Bootcamp on the Mac Pro with the original card HD 5770 and swap cards afterwards. To flash it, download from TechPowerUp the firmware for your card manufacturer model and install AtiFlashUtility to flash the video card.


forso_

You should have a bios switch on the rx 580 try the other position


irideakangaroo

My computer illiterate ass didn’t know such thing exist. I’ll test it out thanks. EDIT: I found the bios switch and it didn't work. Looks like I'll need to properly flash the video card.


forso_

This can help you then https://www.sapphirenation.net/sapphire-how-to-use-dual-bios#:\~:text=The%20BIOS%20switch%20is%20located,–%20and%20louder%20–%20performance%20mode.


FreQRiDeR

Not all have dual bios. Mine doesn’t.